CVE-2025-38427
video: screen_info: Relocate framebuffers behind PCI bridges
In the Linux kernel, the following vulnerability has been resolved: video: screen_info: Relocate framebuffers behind PCI bridges Apply PCI host-bridge window offsets to screen_info framebuffers. Fixes invalid access to I/O memory. Resources behind a PCI host bridge can be relocated by a certain offset in the kernel's CPU address range used for I/O. The framebuffer memory range stored in screen_info refers to the CPU addresses as seen during boot (where the offset is 0). During boot up, firmware may assign a different memory offset to the PCI host bridge and thereby relocating the framebuffer address of the PCI graphics device as seen by the kernel. The information in screen_info must be updated as well. The helper pcibios_bus_to_resource() performs the relocation of the screen_info's framebuffer resource (given in PCI bus addresses). The result matches the I/O-memory resource of the PCI graphics device (given in CPU addresses). As before, we store away the information necessary to later update the information in screen_info itself. Commit 78aa89d1dfba ("firmware/sysfb: Update screen_info for relocated EFI framebuffers") added the code for updating screen_info. It is based on similar functionality that pre-existed in efifb. Efifb uses a pointer to the PCI resource, while the newer code does a memcpy of the region. Hence efifb sees any updates to the PCI resource and avoids the issue. v3: - Only use struct pci_bus_region for PCI bus addresses (Bjorn) - Clarify address semantics in commit messages and comments (Bjorn) v2: - Fixed tags (Takashi, Ivan) - Updated information on efifb
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ a168da3182f8727b338509cb413147aa29012d6f; < cc3cc41ed67054a03134bea42408c720eec0fa04 (affected, git) ≥ 78aa89d1dfba1e3cf4a2e053afa3b4c4ec622371; < 5c70e3ad85d2890d8af375333699429de26327f2 (affected, git) ≥ 78aa89d1dfba1e3cf4a2e053afa3b4c4ec622371; < aeda386d86d79269a08f470dbdc53d13a91e51fa (affected, git) ≥ 78aa89d1dfba1e3cf4a2e053afa3b4c4ec622371; < 2f29b5c231011b94007d2c8a6d793992f2275db1 (affected, git) ≥ 6.6.45; < 6.6.95 (affected, semver) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
6.9 (affected) ≥ 0; < 6.9 (unaffected, semver) ≥ 6.6.95; ≤ 6.6.* (unaffected, semver) ≥ 6.12.35; ≤ 6.12.* (unaffected, semver) ≥ 6.15.4; ≤ 6.15.* (unaffected, semver) ≥ 6.16; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/cc3cc41ed67054a03134bea42408c720eec0fa04CNA: Linux
- https://git.kernel.org/stable/c/5c70e3ad85d2890d8af375333699429de26327f2CNA: Linux
- https://git.kernel.org/stable/c/aeda386d86d79269a08f470dbdc53d13a91e51faCNA: Linux
- https://git.kernel.org/stable/c/2f29b5c231011b94007d2c8a6d793992f2275db1CNA: Linux
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